#region Using Directives and Copyright Notice

// Copyright (c) 2007-2010, Computer Consultancy Pty Ltd
// All rights reserved.
// 
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//     * Redistributions of source code must retain the above copyright
//       notice, this list of conditions and the following disclaimer.
//     * Redistributions in binary form must reproduce the above copyright
//       notice, this list of conditions and the following disclaimer in the
//       documentation and/or other materials provided with the distribution.
//     * Neither the name of the Computer Consultancy Pty Ltd nor the
//       names of its contributors may be used to endorse or promote products
//       derived from this software without specific prior written permission.
// 
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 
// ARE DISCLAIMED. IN NO EVENT SHALL COMPUTER CONSULTANCY PTY LTD BE LIABLE 
// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 
// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 
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// DAMAGE.

using System;
using System.Collections.Generic;
using System.Text;
using System.Threading;

using Interlace.ReactorCore;
using Interlace.ReactorService;

#endregion

namespace Interlace.Tests.Reactor
{
    public class QueueTestService : IService
    {
        int _capacity;
        ReactorQueue<int> _queue = null;
        ManualResetEvent _finishedEvent = null;
        bool _isFinished = true;
        List<int> _dequeuedObjects = null;

        public delegate bool FinishedPredicate(List<int> dequeuedObjects);

        FinishedPredicate _predicate;

        public ReactorQueue<int> Queue { get { return _queue; } }

        public ManualResetEvent FinishedEvent { get { return _finishedEvent; } }

        public QueueTestService(int capacity, FinishedPredicate predicate)
        {
            _capacity = capacity;
            _predicate = predicate;
        }

        public void Open(IServiceHost host)
        {
            _queue = new ReactorQueue<int>(_capacity);
            _finishedEvent = new ManualResetEvent(false);
            _isFinished = false;
            _dequeuedObjects = new List<int>();

            _queue.StartDequeuingToCallback(host.Reactor, DequeueCallback);
        }

        void DequeueCallback(ReactorQueue<int> queue, int item)
        {
            _dequeuedObjects.Add(item);

            if (!_isFinished && _predicate(_dequeuedObjects))
            {
                _isFinished = true;

                _finishedEvent.Set();
            }
        }

        public void Close(IServiceHost host)
        {
            _queue.StopDequeuingToCallback();

            if (!_isFinished) _finishedEvent.Set();

            _finishedEvent.Close();

            _queue = null;
            _finishedEvent = null;
            _isFinished = true;
            _dequeuedObjects = null;
        }
    }
}
